13
RB SERIES ENGINEERING GUIDE
Air Handler Insulation
Washable air handler insulation surface provides cleanability to
further enhance IAQ.
Thermostatic Expansion Valve
All units utilize a balanced port bidirectional thermostatic expansion
valve (TXV) for refrigerant metering. This allows precise refrigerant
flow in a wide range of entering water variation (20 to 120°F [-7
to 49°C]) found in geothermal systems. The TXV is located in the
compressor compartment for easy access.
Water-to-Refrigerant Coaxial Heat Exchanger Coil
Coaxial refrigerant to water heat exchangers provide unparalleled
efficiency. The coaxes are designed for low pressure drop and low
flow rates. All coaxes are pressure rated to 450 psi water side and
600 psi on the refrigerant side. Optional ThermaShield coating is
available on the water-to-refrigerant heat exchanger to prevent
condensation in low temperature loop operation.
Service Connections
and Serviceability
Two Schrader service ports are provided
in every unit. The suction side and
discharge side ports are for field charging
and servicing access. All valves are
7/16 in. SAE connections. All water and
electrical connections are made from the
front of the unit. Unit is designed for front
access serviceability.
4-Way Reversing Valve
All units feature a reliable all-brass pilot operated refrigerant
reversing valve. The reversing valve operation is limited to change
of mode by the control to enhance reliability.
All-Aluminum Air Coil
These air coils are constructed
of lanced fin and rifled tube
aluminum that is not susceptible to
formicary corrosion. For additional
condensate runoff and meeting
project specifications, an optional
AlumiSeal e-coating is available.
Inside the RB Series cont.
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